Kovacic to miss games against Zenit, Leeds and EvertonMidfielder was due to return from injury in Champions LeagueChelsea’s problems in midfield have deepened after Mateo Kovacic tested positive for Covid-19 a day after returning to training from a lengthy absence with a hamstring injury.

Thomas Tuchel, who will be without N’Golo Kanté and Jorginho when
Chelsea look to win their
Champions League group by beating Zenit St Petersburg on Wednesday, had hoped to include Kovacic against Leeds on Saturday. The midfielder has not featured since 26 October and his presence in training on Monday was a boost, particularly as there is no timeframe on Kanté’s return from a knee injury and Jorginho has been playing through back and hip pain.